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When white light is incident on a glass prism, it undergoes dispersion. This phenomenon is due to ________.
refractive index of the glass being different for different colours
interference of the light
diffraction of the light
refractive index of the glass being the same for different colours
refractive index of the glass being different for different colours
When white light passes through a glass prism, it splits into its seven constituent colors (VIBGYOR). This phenomenon of splitting of white light is called dispersion, and it occurs because the refractive index of glass is different for different wavelengths (colors) of light.
When white light passes through a glass prism, it splits into its seven constituent colors (VIBGYOR). This phenomenon of splitting of white light is called dispersion, and it occurs because the refractive index of glass is different for different wavelengths (colors) of light.
Think of a group of runners of different speeds trying to navigate a crowded obstacle course; the ones who slow down more (higher refractive index) take a sharper turn and separate from the rest.
VIBGYOR тАФ Violet Indigo Blue Green Yellow Orange Red (in increasing order of wavelength and decreasing order of deviation).
╬╝=vcтАЛ тАФ Refractive index formula
╬┤=(╬╝тИТ1)A тАФ Deviation angle for a thin prism
White light is a collection of different wavelengths. According to Cauchy's relation, the refractive index (╬╝)of a medium depends on the wavelength (╬╗)as \mu = A$$+ \frac{B}{\lambda┬▓}. Since violet light has the shortest wavelength, it experiences the maximum refractive index and bends the most. Red light has the longest wavelength, experiences the minimum refractive index, and bends the least.
Dispersion is the splitting of white light into its component colors.
Violet light deviates the most due to its shorter wavelength and higher refractive index.
Red light deviates the least due to its longer wavelength and lower refractive index.
Isaac Newton was the first to use a glass prism to obtain the spectrum of sunlight.
Helps in understanding the polychromatic nature of light
Forms the working principle behind spectrometers and rainbow formation
Formation of rainbows in the atmosphere after rain
Spectroscopic analysis of light sources in astronomy
Option B, C, D are incorrect because interference and diffraction are wave phenomena related to superposition and bending around obstacles, while different refractive index for different colors specifically accounts for chromatic dispersion in prisms.
A is correct тАФ refractive index of the glass being different for different colours
Always remember that speed of light in a medium depends on wavelength because of dispersion; in vacuum, all colors travel at the exact same speed c.
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